Core drill attachment



2.1 : Back

2.2 : Front

2.3 : Top

2.4 : Right

2.5 : Bottom

View 2.1 : back view of core drill attachment; 2.2 front view thereof; 2.3 top view thereof; 2.4 right view thereof; 2.5 bottom view thereof. 

CLAIM The ornamental design for a core drill attachment, as shown and described. 